2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
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12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
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25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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33 * All rights reserved.
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36 * modification, are permitted provided that the following conditions
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44 * may be used to endorse or promote products derived from this software
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48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
62 #include <sys/cdefs.h>
63 __FBSDID("$FreeBSD$");
65 #include "opt_ipsec.h"
66 #include "opt_inet6.h"
68 #include <sys/param.h>
69 #include <sys/errno.h>
72 #include <sys/malloc.h>
76 #include <sys/protosw.h>
77 #include <sys/signalvar.h>
78 #include <sys/socket.h>
79 #include <sys/socketvar.h>
81 #include <sys/syslog.h>
84 #include <net/if_types.h>
85 #include <net/route.h>
88 #include <netinet/in.h>
89 #include <netinet/in_var.h>
90 #include <netinet/in_systm.h>
91 #include <netinet/in_pcb.h>
93 #include <netinet/icmp6.h>
94 #include <netinet/ip6.h>
95 #include <netinet6/ip6protosw.h>
96 #include <netinet6/ip6_mroute.h>
97 #include <netinet6/in6_pcb.h>
98 #include <netinet6/ip6_var.h>
99 #include <netinet6/nd6.h>
100 #include <netinet6/raw_ip6.h>
101 #include <netinet6/scope6_var.h>
104 #include <netipsec/ipsec.h>
105 #include <netipsec/ipsec6.h>
108 #include <machine/stdarg.h>
110 #define satosin6(sa) ((struct sockaddr_in6 *)(sa))
111 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
114 * Raw interface to IP6 protocol.
117 VNET_DECLARE(struct inpcbhead, ripcb);
118 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
119 #define V_ripcb VNET(ripcb)
120 #define V_ripcbinfo VNET(ripcbinfo)
122 VNET_DEFINE(struct rip6stat, rip6stat);
124 extern u_long rip_sendspace;
125 extern u_long rip_recvspace;
128 * Hooks for multicast routing. They all default to NULL, so leave them not
129 * initialized and rely on BSS being set to 0.
133 * The socket used to communicate with the multicast routing daemon.
135 VNET_DEFINE(struct socket *, ip6_mrouter);
138 * The various mrouter functions.
140 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
141 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
142 int (*ip6_mrouter_done)(void);
143 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
144 int (*mrt6_ioctl)(u_long, caddr_t);
147 * Setup generic address and protocol structures for raw_input routine, then
148 * pass them along with mbuf chain.
151 rip6_input(struct mbuf **mp, int *offp, int proto)
154 struct mbuf *m = *mp;
155 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
156 register struct inpcb *in6p;
157 struct inpcb *last = 0;
158 struct mbuf *opts = NULL;
159 struct sockaddr_in6 fromsa;
161 V_rip6stat.rip6s_ipackets++;
163 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
164 /* XXX Send icmp6 host/port unreach? */
166 return (IPPROTO_DONE);
169 init_sin6(&fromsa, m); /* general init */
171 ifp = m->m_pkthdr.rcvif;
173 INP_INFO_RLOCK(&V_ripcbinfo);
174 LIST_FOREACH(in6p, &V_ripcb, inp_list) {
175 /* XXX inp locking */
176 if ((in6p->inp_vflag & INP_IPV6) == 0)
178 if (in6p->inp_ip_p &&
179 in6p->inp_ip_p != proto)
181 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
182 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
184 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
185 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
187 if (jailed(in6p->inp_cred)) {
189 * Allow raw socket in jail to receive multicast;
190 * assume process had PRIV_NETINET_RAW at attach,
191 * and fall through into normal filter path if so.
193 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
194 prison_check_ip6(in6p->inp_cred,
198 if (in6p->in6p_cksum != -1) {
199 V_rip6stat.rip6s_isum++;
200 if (in6_cksum(m, proto, *offp,
201 m->m_pkthdr.len - *offp)) {
203 V_rip6stat.rip6s_badsum++;
209 * If this raw socket has multicast state, and we
210 * have received a multicast, check if this socket
211 * should receive it, as multicast filtering is now
212 * the responsibility of the transport layer.
214 if (in6p->in6p_moptions &&
215 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
216 struct sockaddr_in6 mcaddr;
219 bzero(&mcaddr, sizeof(struct sockaddr_in6));
220 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
221 mcaddr.sin6_family = AF_INET6;
222 mcaddr.sin6_addr = ip6->ip6_dst;
224 blocked = im6o_mc_filter(in6p->in6p_moptions, ifp,
225 (struct sockaddr *)&mcaddr,
226 (struct sockaddr *)&fromsa);
227 if (blocked != MCAST_PASS) {
228 IP6STAT_INC(ip6s_notmember);
233 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
237 * Check AH/ESP integrity.
239 if (n && ipsec6_in_reject(n, last)) {
241 V_ipsec6stat.in_polvio++;
242 /* Do not inject data into pcb. */
246 if (last->inp_flags & INP_CONTROLOPTS ||
247 last->inp_socket->so_options & SO_TIMESTAMP)
248 ip6_savecontrol(last, n, &opts);
249 /* strip intermediate headers */
251 if (sbappendaddr(&last->inp_socket->so_rcv,
252 (struct sockaddr *)&fromsa,
257 V_rip6stat.rip6s_fullsock++;
259 sorwakeup(last->inp_socket);
266 INP_INFO_RUNLOCK(&V_ripcbinfo);
269 * Check AH/ESP integrity.
271 if ((last != NULL) && ipsec6_in_reject(m, last)) {
273 V_ipsec6stat.in_polvio++;
274 V_ip6stat.ip6s_delivered--;
275 /* Do not inject data into pcb. */
280 if (last->inp_flags & INP_CONTROLOPTS ||
281 last->inp_socket->so_options & SO_TIMESTAMP)
282 ip6_savecontrol(last, m, &opts);
283 /* Strip intermediate headers. */
285 if (sbappendaddr(&last->inp_socket->so_rcv,
286 (struct sockaddr *)&fromsa, m, opts) == 0) {
290 V_rip6stat.rip6s_fullsock++;
292 sorwakeup(last->inp_socket);
295 V_rip6stat.rip6s_nosock++;
296 if (m->m_flags & M_MCAST)
297 V_rip6stat.rip6s_nosockmcast++;
298 if (proto == IPPROTO_NONE)
301 char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
302 icmp6_error(m, ICMP6_PARAM_PROB,
303 ICMP6_PARAMPROB_NEXTHEADER,
304 prvnxtp - mtod(m, char *));
306 V_ip6stat.ip6s_delivered--;
308 return (IPPROTO_DONE);
312 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
317 struct ip6ctlparam *ip6cp = NULL;
318 const struct sockaddr_in6 *sa6_src = NULL;
320 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
322 if (sa->sa_family != AF_INET6 ||
323 sa->sa_len != sizeof(struct sockaddr_in6))
326 if ((unsigned)cmd >= PRC_NCMDS)
328 if (PRC_IS_REDIRECT(cmd))
329 notify = in6_rtchange, d = NULL;
330 else if (cmd == PRC_HOSTDEAD)
332 else if (inet6ctlerrmap[cmd] == 0)
336 * If the parameter is from icmp6, decode it.
339 ip6cp = (struct ip6ctlparam *)d;
341 ip6 = ip6cp->ip6c_ip6;
342 off = ip6cp->ip6c_off;
343 cmdarg = ip6cp->ip6c_cmdarg;
344 sa6_src = ip6cp->ip6c_src;
352 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
353 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
357 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
358 * may have setup with control call.
362 rip6_output(struct mbuf *m, ...)
364 rip6_output(m, va_alist)
369 struct mbuf *control;
371 struct sockaddr_in6 *dstsock;
372 struct in6_addr *dst;
375 u_int plen = m->m_pkthdr.len;
377 struct ip6_pktopts opt, *optp;
378 struct ifnet *oifp = NULL;
379 int type = 0, code = 0; /* for ICMPv6 output statistics only */
380 int scope_ambiguous = 0;
381 struct in6_addr in6a;
385 so = va_arg(ap, struct socket *);
386 dstsock = va_arg(ap, struct sockaddr_in6 *);
387 control = va_arg(ap, struct mbuf *);
390 in6p = sotoinpcb(so);
393 dst = &dstsock->sin6_addr;
394 if (control != NULL) {
395 if ((error = ip6_setpktopts(control, &opt,
396 in6p->in6p_outputopts, so->so_cred,
397 so->so_proto->pr_protocol)) != 0) {
402 optp = in6p->in6p_outputopts;
405 * Check and convert scope zone ID into internal form.
407 * XXX: we may still need to determine the zone later.
409 if (!(so->so_state & SS_ISCONNECTED)) {
410 if (dstsock->sin6_scope_id == 0 && !V_ip6_use_defzone)
412 if ((error = sa6_embedscope(dstsock, V_ip6_use_defzone)) != 0)
417 * For an ICMPv6 packet, we should know its type and code to update
420 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
421 struct icmp6_hdr *icmp6;
422 if (m->m_len < sizeof(struct icmp6_hdr) &&
423 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
427 icmp6 = mtod(m, struct icmp6_hdr *);
428 type = icmp6->icmp6_type;
429 code = icmp6->icmp6_code;
432 M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
437 ip6 = mtod(m, struct ip6_hdr *);
440 * Source address selection.
442 error = in6_selectsrc(dstsock, optp, in6p, NULL, so->so_cred,
446 error = prison_get_ip6(in6p->inp_cred, &in6a);
451 if (oifp && scope_ambiguous) {
453 * Application should provide a proper zone ID or the use of
454 * default zone IDs should be enabled. Unfortunately, some
455 * applications do not behave as it should, so we need a
456 * workaround. Even if an appropriate ID is not determined
457 * (when it's required), if we can determine the outgoing
458 * interface. determine the zone ID based on the interface.
460 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL);
464 ip6->ip6_dst = dstsock->sin6_addr;
467 * Fill in the rest of the IPv6 header fields.
469 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
470 (in6p->inp_flow & IPV6_FLOWINFO_MASK);
471 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
472 (IPV6_VERSION & IPV6_VERSION_MASK);
475 * ip6_plen will be filled in ip6_output, so not fill it here.
477 ip6->ip6_nxt = in6p->inp_ip_p;
478 ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
480 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
481 in6p->in6p_cksum != -1) {
486 /* Compute checksum. */
487 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
488 off = offsetof(struct icmp6_hdr, icmp6_cksum);
490 off = in6p->in6p_cksum;
491 if (plen < off + 1) {
495 off += sizeof(struct ip6_hdr);
498 while (n && n->m_len <= off) {
504 p = (u_int16_t *)(mtod(n, caddr_t) + off);
506 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
509 error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
510 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
512 icmp6_ifoutstat_inc(oifp, type, code);
513 ICMP6STAT_INC(icp6s_outhist[type]);
515 V_rip6stat.rip6s_opackets++;
524 if (control != NULL) {
525 ip6_clearpktopts(&opt, -1);
533 * Raw IPv6 socket option processing.
536 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
540 if (sopt->sopt_level == IPPROTO_ICMPV6)
542 * XXX: is it better to call icmp6_ctloutput() directly
545 return (icmp6_ctloutput(so, sopt));
546 else if (sopt->sopt_level != IPPROTO_IPV6)
551 switch (sopt->sopt_dir) {
553 switch (sopt->sopt_name) {
561 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
565 error = ip6_raw_ctloutput(so, sopt);
568 error = ip6_ctloutput(so, sopt);
574 switch (sopt->sopt_name) {
582 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
586 error = ip6_raw_ctloutput(so, sopt);
589 error = ip6_ctloutput(so, sopt);
599 rip6_attach(struct socket *so, int proto, struct thread *td)
602 struct icmp6_filter *filter;
606 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
608 error = priv_check(td, PRIV_NETINET_RAW);
611 error = soreserve(so, rip_sendspace, rip_recvspace);
614 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
617 INP_INFO_WLOCK(&V_ripcbinfo);
618 error = in_pcballoc(so, &V_ripcbinfo);
620 INP_INFO_WUNLOCK(&V_ripcbinfo);
624 inp = (struct inpcb *)so->so_pcb;
625 INP_INFO_WUNLOCK(&V_ripcbinfo);
626 inp->inp_vflag |= INP_IPV6;
627 inp->inp_ip_p = (long)proto;
628 inp->in6p_hops = -1; /* use kernel default */
629 inp->in6p_cksum = -1;
630 inp->in6p_icmp6filt = filter;
631 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
637 rip6_detach(struct socket *so)
642 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
644 if (so == V_ip6_mrouter && ip6_mrouter_done)
647 INP_INFO_WLOCK(&V_ripcbinfo);
649 free(inp->in6p_icmp6filt, M_PCB);
652 INP_INFO_WUNLOCK(&V_ripcbinfo);
655 /* XXXRW: This can't ever be called. */
657 rip6_abort(struct socket *so)
662 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
664 soisdisconnected(so);
668 rip6_close(struct socket *so)
673 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
675 soisdisconnected(so);
679 rip6_disconnect(struct socket *so)
684 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
686 if ((so->so_state & SS_ISCONNECTED) == 0)
688 inp->in6p_faddr = in6addr_any;
694 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
697 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
698 struct ifaddr *ifa = NULL;
702 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
704 if (nam->sa_len != sizeof(*addr))
706 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
708 if (TAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
709 return (EADDRNOTAVAIL);
710 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
713 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
714 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL)
715 return (EADDRNOTAVAIL);
717 ((struct in6_ifaddr *)ifa)->ia6_flags &
718 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
719 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
721 return (EADDRNOTAVAIL);
725 INP_INFO_WLOCK(&V_ripcbinfo);
727 inp->in6p_laddr = addr->sin6_addr;
729 INP_INFO_WUNLOCK(&V_ripcbinfo);
734 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
737 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
738 struct in6_addr in6a;
739 struct ifnet *ifp = NULL;
740 int error = 0, scope_ambiguous = 0;
743 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
745 if (nam->sa_len != sizeof(*addr))
747 if (TAILQ_EMPTY(&V_ifnet))
748 return (EADDRNOTAVAIL);
749 if (addr->sin6_family != AF_INET6)
750 return (EAFNOSUPPORT);
753 * Application should provide a proper zone ID or the use of default
754 * zone IDs should be enabled. Unfortunately, some applications do
755 * not behave as it should, so we need a workaround. Even if an
756 * appropriate ID is not determined, we'll see if we can determine
757 * the outgoing interface. If we can, determine the zone ID based on
758 * the interface below.
760 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
762 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
765 INP_INFO_WLOCK(&V_ripcbinfo);
767 /* Source address selection. XXX: need pcblookup? */
768 error = in6_selectsrc(addr, inp->in6p_outputopts,
769 inp, NULL, so->so_cred, &ifp, &in6a);
772 INP_INFO_WUNLOCK(&V_ripcbinfo);
777 if (ifp && scope_ambiguous &&
778 (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) {
780 INP_INFO_WUNLOCK(&V_ripcbinfo);
783 inp->in6p_faddr = addr->sin6_addr;
784 inp->in6p_laddr = in6a;
787 INP_INFO_WUNLOCK(&V_ripcbinfo);
792 rip6_shutdown(struct socket *so)
797 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
806 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
807 struct mbuf *control, struct thread *td)
810 struct sockaddr_in6 tmp;
811 struct sockaddr_in6 *dst;
815 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
817 /* Always copy sockaddr to avoid overwrites. */
819 if (so->so_state & SS_ISCONNECTED) {
825 bzero(&tmp, sizeof(tmp));
826 tmp.sin6_family = AF_INET6;
827 tmp.sin6_len = sizeof(struct sockaddr_in6);
829 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
830 sizeof(struct in6_addr));
838 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
842 tmp = *(struct sockaddr_in6 *)nam;
845 if (dst->sin6_family == AF_UNSPEC) {
847 * XXX: we allow this case for backward
848 * compatibility to buggy applications that
849 * rely on old (and wrong) kernel behavior.
851 log(LOG_INFO, "rip6 SEND: address family is "
852 "unspec. Assume AF_INET6\n");
853 dst->sin6_family = AF_INET6;
854 } else if (dst->sin6_family != AF_INET6) {
856 return(EAFNOSUPPORT);
859 ret = rip6_output(m, so, dst, control);
863 struct pr_usrreqs rip6_usrreqs = {
864 .pru_abort = rip6_abort,
865 .pru_attach = rip6_attach,
866 .pru_bind = rip6_bind,
867 .pru_connect = rip6_connect,
868 .pru_control = in6_control,
869 .pru_detach = rip6_detach,
870 .pru_disconnect = rip6_disconnect,
871 .pru_peeraddr = in6_getpeeraddr,
872 .pru_send = rip6_send,
873 .pru_shutdown = rip6_shutdown,
874 .pru_sockaddr = in6_getsockaddr,
875 .pru_close = rip6_close,